The CigarMedics HumidiMeter is the affordable, fast and easy way to tell if your cigar is ready to smoke. Simply, press the “On” button and insert the two metal probes into the cigar’s foot or cap. In seconds, you will get the moisture content that is inside your cigar and display the results in terms of relative humidity. Based on the reading, you will know if your cigar is ready to smoke or if it needs more time in the humidor. Also, it can help you determine when to rotate the cigars in your humidor, so they can get the proper humidification they need. Unlike other meters that won’t fit your cigar, the probes on the CigarMedics HumidiMeter were specifically placed so they can be used on cigars with a 38-ring gauge or larger. This precise placement provides a more accurate reading. Uses four (4) LR44 batteries (included).